<template>
    <div class="login_container">
      <div class="login_box">
            <!-- 头像区域-->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登入表单区域-->
            <el-form ref="loginFormRef" label-width="0" class="login_form" :model="loginForm" :rules="loginFormRules">
                 <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                 <el-form-item class="btns" >
                    <el-button type="primary" @click="login" >登入</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>   

      </div>
    </div>
</template>

<script>
export default {
    data (){
        // 这是登入表单的数据绑定对象
        return{
        loginForm:{
                username:'admin',
                password:'123456'
                },
                // 表单的验证规则对象
        loginFormRules:{
            // 验证用户名是否合法
                username:[
                    { required: true, message: '请输入登入名称', trigger: 'blur' },
                    { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
                ],
            // //验证密码是否合法
                password:[
                     { required: true, message: '请输入登入密码', trigger: 'blur' },
                     { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
                }
            };
           
        },
    methods:{
        resetLoginForm(){
            //console.log(this);
            this.$refs.loginFormRef.resetFields();
            },
        login(){
            this.$refs.loginFormRef.validate(async valid =>{
               if(!valid) return;
               const {data : res} = await this.$http.post('login',this.loginForm);
               //console.log(res);
               if(res.meta.status !== 200) return this.$message.error('登入失败');
               this.$message.success('登入成功');
               //保存token到sessionStorage
               window.sessionStorage.setItem("token",res.data.token);
              //通过编程式导航，跳转到后台主页
               this.$router.push('/home');
            });
        }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    border-radius: 3px;
    background-color:#fff;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);

     .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;   
            }
       } 
    }
    .login_form{
           position: absolute;
           bottom: 0;
           width: 100%;
           padding: 0 20px;
           box-sizing: border-box;
       }
    .btns{
           display: flex;
           justify-content:flex-end;
       }

   
</style>